Garlic as a Lipid Lowering Agent-
A Meta-Analysis

This section is compiled by Frank M. Painter, D.C.
Send all comments or additions to:    Frankp@chiro.org

Journal of the Royal College of Physicians of London 1994;   28(1)

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Garlic supplements may have an important role to play in the treatment of hypercholesterolaemia. To determine the effect of garlic on serum lipids and lipoproteins relative to placebo and other lipid lowering agents, a systematic review, including meta- analysis, was undertaken of published and unpublished randomized controlled trials of garlic preparations of at least four weeks duration.

Studies were identified by a search of MEDLINE and the ALTERNATIVE MEDICINE electronic databases, from references listed in primary and review articles, and through direct contact with garlic manufacturers. Sixteen trials, with data from 952 subjects, were included in the analyses.

Many of the trials had methodological shortcomings. The pooled mean difference in the absolute change (from baseline to final measurement in mmol/l) of total serum cholesterol, triglycerides, and high-density lipoprotein (HDL)-cholesterol was compared between subjects treated with garlic therapy against those treated with placebo or other agents. The mean difference in reduction of total cholesterol between garlic-treated subjects and those receiving placebo (or avoiding garlic in their diet) was -0.77 mmol/l (95% CI: -0.65, -0.89 mmol/l). These changes represent a 12% reduction with garlic therapy beyond the final levels achieved with placebo alone.

The reduction was evident after one month of therapy and persisted for at least six months. In the dried garlic powders, in which the allicin content is standardized, there was no significant difference in the size of the reduction across the dose range of 600-900 mg daily. Dried garlic powder preparations also significantly lowered serum triglyceride by 0.31 mmol/l compared to placebo (95% CI: -0.14, -0.49). HDL-cholesterol was non-significantly lowered by 0.04 mmol/l (95% CI: -0.11, 0.03 mmol l). Side effects from garlic therapy, other than odor, were rare.

In conclusion, use of garlic therapy, either as dried garlic preparations (in doses as low as 600 mg per day) or as fresh, high allicin yielding garlic (10-20 g per day) appears significantly to reduce total serum cholesterol over a 1-3 month period. However, more rigorously designed and analyzed trials are needed.

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